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I have a single pump 8 batt's 1/2 inch pressure fittings and an
#7 pump head, my question is. When I tap my switch it sounds ok, but when I hit the switch it sounds like it grinds inside the pump, nothing is loose in there, can enybody please help.

#7 pump head, my question is. When I tap my switch it sounds ok, but when I hit the switch it sounds like it grinds inside the pump, nothing is loose in there, can enybody please help.